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lactulose.

A synthetic disaccharide C₁₂H₂₂O₁₁ consisting of galactose and fructose units, used as a laxative for chronic constipation and as an acidifier to reduce blood ammonia levels causing neurological symptoms in advanced liver disease. It is used in solution for oral or rectal administration.

9 characters3 syllables approx.English language

Meaning & usage

noun/ˈlak.tjʊ.ləʊz/Received-Pronunciation/ˈlæk.t(j)ʊˌloʊs/General-American
  1. A synthetic disaccharide C₁₂H₂₂O₁₁ consisting of galactose and fructose units, used as a laxative for chronic constipation and as an acidifier to reduce blood ammonia levels causing neurological symptoms in advanced liver disease. It is used in solution for oral or rectal administration.

    countable · uncountable
Where this word comes from

Etymology tree English lact- Proto-Indo-European *ḱel-der. Latin cella Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -ula Latin cellulabor. French cellule Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ŏ̄dsos? Old Latin -ōssus Latin -ōsuslbor. French -ose French cellulosebor. English (cell)ulose English lactulose From lact- + (cell)ulose.

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Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.